The sturdiness of post-tensioning tendons relies absolutely at the sturdiness of the fabrics used, yet there are layout inspiration specifics that are additionally of significant significance: the post-tensioning structure and layers of safety equivalent to concrete disguise and chosen fabrics in view of the aggressivity of our surroundings for instance.
It is widely known that sustainability rules advisor the Engineer from the very starting, on the venture notion, in the course of building and the carrier lifetime of a constitution. judgements made in the course of conceptual and layout level have the most important impact at the longevity and sustainability of post-tensioning tendons. fib Bulletin 33 addresses the specifics for prestressed concrete constructions: the sturdiness of post-tensioning tendons. it's going to be famous that it doesn't repeat subject matters which were addressed in different fib announcements and that's universal for either strengthened concrete and prestressed concrete structures.
Pre-tensioning, that's used largely within the precast undefined, isn't really thought of the following, even if conclusions and suggestions herein could, in lots of circumstances, even be applicable.
This advice was once ready by way of operating celebration 5.4.2, sturdiness specifics for prestressed concrete buildings, in cooperation with fib fee nine, Reinforcing and prestressing fabrics and platforms. A initial model of this advice served because the simple rfile for the second one workshop on "Durability of post-tensioning tendons", hung on 11-12 October 2004 in Zurich. This workshop was once a follow-up to the 1st workshop held in Ghent in 2001. Bulletin 33 comprises revisions resembling the agreed result of the Zurich workshop.
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Additional resources for FIB 33: Durability of post-tensioning tendons
This is particularly important on surfaces where corrosion may impair the proper functioning of the component. This applies especially to the anchor head wedge cavities, the 34 2 Materials and construction wedges and also to the inside of the ducts. g. by grouting. g. the outside of bearing plates cast into concrete, is not harmful and therefore, not considered reason to reject these materials. Due to its high strength, prestressing steel is more susceptible to corrosion (in particular pitting) than other components and therefore, must be stored and protected carefully.
Another concern which has arisen because of the high coefficient of thermal expansion of plastics is that installation of a plastic duct at elevated temperatures may form a gap in the concrete around the duct once the structure and duct cool down. Theoretical as well as experimental investigations have confirmed that this concern is not justified, such gaps do not develop, . Any eventual risk may further be reduced with appropriate grouting procedures in which the final grouting pressure is maintained while all the vents are closed.
Bare prestressing steel can be packed and wrapped by the manufacturer to provide specified temporary protection. The prestressing steel should be stored on site in a dry and clean location, off the ground, and with sufficient ventilation to prevent condensation. In special cases, it may be stored in an air-conditioned area. For extended periods of storage on site, the temporary protection can be improved by application of oils onto the prestressing steel. These oils should not contain substances potentially harmful to the prestressing steel.